Relaxation effects in Mössbauer spectra of bridged seven-coordinate Fe3+ pairs |
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| Authors: | V H McCann J B Ward V McKee K Faulalo D H Jones |
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| Institution: | (1) University of Canterbury, Christchurch, New Zealand;(2) Physics Department, Liverpool University, L69 3BX Liverpool, England |
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| Abstract: | The compound Fe2L(H2O)4] (ClO4)4.H2O which contains pairs of Fe3+ ions within a binucleating macrocycle derived from Schiff base condensation of 2,6-diacetylpyridine and 1,3-diamino-2-hydroxy-propane has been studied by magnetic susceptibility measurements and57Fe Mössbauer spectroscopy between 4.2 K and 300 K, and its crystal structure determined. The spectra show relaxation effects at all temperatures. Spectra taken at 4.2 K in applied fields of about 3 T showed thatV zz is positive and η～0. The spectra were fitted using a stochastic model of a magnetic hyperfine field relaxing parallel to thez axis, giving relaxation times of 10?9?10?10 s. |
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